"A big, glib, dapper man who spoke with an accent, he was almost always cast as some sort of a Continental gentleman," reported The New York Times.

[2] At age eleven Kasznar appeared in Der Zirkuskönig (The King of the Circus, 1924), the last movie made by Max Linder, which was filmed in Vienna.

[2] While in service, Corporal Kurt S. Kasznar wrote and performed in his only play, First Cousins, which he dedicated "to the thousands of foreign-born American soldiers."

The one-act plays were performed on Broadway for the benefit of the Sailors and Soldiers Club, and were later staged at Hyde Park for President Franklin D. Roosevelt.

[7] Co-starring William Shatner as Archie Goodwin and initially slated to air on CBS in September 1959,[7] the Nero Wolfe series was aborted after a pilot and a few episodes were filmed.

[8][9][10] Kasznar created the role of Max Detweiler in the original Broadway production of The Sound of Music (1959–1963), for which he received a Tony Award nomination.

[5] In 1974–1975 Kasznar, Myrna Loy, Edward Mulhare and Ricardo Montalbán toured nationwide in John Houseman's production of George Bernard Shaw's Don Juan in Hell, playing 158 cities in six months.

His feature films included Lili, Kiss Me Kate, The Last Time I Saw Paris, My Sister Eileen, A Farewell to Arms and 55 Days at Peking.

She died at home unexpectedly in June 1948, at age 48; at the time, Kasznar was performing in John Houseman's Broadway production of Joy to the World.